High electrostrictive properties and energy storage performances with excellent thermal stability in Nb-doped Bi(0.5)Na(0.5)TiO(3)-based ceramics.
High electrostrictive properties and energy storage performances with excellent thermal stability in Nb-doped Bi(0.5)Na(0.5)TiO(3)-based ceramics.
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DOI：
10.1039/c9ra04069b
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发表时间：
2019-07-05
期刊：
影响因子：
3.9
通讯作者：
Dong, Xianlin
中科院分区：
文献类型：
--
作者：
Wu, Yichen;Wang, Genshui;Jiao, Zheng;Fan, Yuzhu;Peng, Ping;Dong, Xianlin
无铅Bi0.5Na0.5TiO3 （BNT）体系具有优异的压电和铁电性能，是替代Pb(ZrTi)O3 （PZT）的理想材料。然而，这些电性能的弱热稳定性阻碍了它的实际应用。本文设计并制备了具有优异温度稳定性的新型nb掺杂0.76Bi0.5Na0.5TiO3-0.24Bi0.5K0.5TiO3 （BNT-BKT）陶瓷。5%掺nb的BNT-BKT陶瓷在室温至160℃范围内的应变和放电性能变化分别小于3%和12.5%，这是由于脱极化温度（Td或TF-R）与最高介电温度（Tm）之间的间隙增大所致。此外，我们还详细研究了Nb掺杂对BNT-BKT陶瓷相变、介电、压电和铁电行为的影响。随温度变化的介电谱表明，随着Nb的修饰，Td在室温下降低，表明相结构由铁电型转变为遍历弛豫型。因此，在临界成分中掺入5% Nb时，同时获得了最大应变值0.21%和1.2 J cm−3的可回收储能。我们的研究结果为获得同时具有热稳定应变和放电性能的btc基陶瓷提供了一种有效的方法，可用于宽温度致动器和电容器。降低Td以扩大Td与最高介电温度（Tm）之间的温度范围是提高bnt基陶瓷热稳定性、应变和储能性能的有效策略。
As a promising candidate material replacing Pb(ZrTi)O3 (PZT), the lead-free Bi0.5Na0.5TiO3 (BNT) system exhibits outstanding piezoelectric and ferroelectric properties. However, the weak thermal stability of these electric properties hampers its practical applications. In this work, we designed and prepared novel Nb-doped 0.76Bi0.5Na0.5TiO3–0.24Bi0.5K0.5TiO3 (BNT–BKT) ceramics with superior temperature stability of electric properties. Both strain as well as discharging properties of 5% Nb-doped BNT–BKT ceramics varied less than 3% and 12.5% respectively from room temperature to 160 °C, ascribed to the enlarged gap between the depolarized temperature (Td or TF–R) and the maximum dielectric temperature (Tm). In addition, we investigated the impacts of Nb doping on the phase transition, dielectric, piezoelectric and ferroelectric behaviors of BNT–BKT ceramics in detail. Temperature dependent dielectric spectrums indicated that Td decreased below room temperature with Nb modifying, revealing that the phase structure transformed from ferroelectric into ergodic relaxor. Accordingly, the maximum strain value of 0.21% and recoverable energy storage of 1.2 J cm−3 were simultaneously acquired at the critical composition of 5% Nb incorporation. Our results provide an effective means of obtaining BNT-based ceramics with simultaneously thermally stable strain and discharge properties for wide temperature actuator and capacitor applications. Lowering Td to enlarge the temperature range between Td and the maximum dielectric temperature (Tm) proved to be an effective strategy to enhance the thermal stability strain and energy storage properties in BNT-based ceramics.
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DOI：
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影响因子：
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